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The PC processes device interrupts according to their priority level. This is a function of which interrupt line they use to enter the interrupt controller. For this reason, the priority levels are directly tied to the interrupt number:
In any event, the priority level of the IRQs doesn't make much of a difference in the performance of the machine, so it isn't something you're going to want to worry about too much. If you are a real performance freak, higher-priority IRQs may improve the performance of the devices that use them slightly. If you could actually notice this in any way other than examining the system under the microscope of a benchmark suite, I'd be pretty surprised...